作　　者： ; ;

机构地区： 韩山师范学院生物系

出　　处： 《西北农林科技大学学报（自然科学版）》 2009年第5期211-216,共6页

摘　　要： 【目的】定点观察粤东地区农林业入侵杂草五爪金龙(Ipomoeacairica L.)的开花动态,并研究其有性繁育系统类型。【方法】在生态学外业调查的基础上确定4个样地,观察五爪金龙开花动态,计算花粉-胚珠比(P/O)、种子-胚珠比(S/O)、花粉活性率、柱头可授率和杂交指数OCI。【结果】五爪金龙花粉-胚珠比(P/O)为2224,种子-胚珠比(S/O)为0.56,介于兼性异交与专性异交之间,以异交为主。五爪金龙开花期持续时间长,结实期短,单花开放时间仅为1d。花粉活性率和柱头可授率在一天中均呈现抛物线趋势,且各自的最高峰分别出现在上午09:30与下午14:30～15:30;杂交指数OCI=5,为部分自交亲和,异交,需传粉者。【结论】五爪金龙繁育系统类型为混交繁育系统,即自交和异交并存;建议对五爪金龙采用全株清除的人工防治措施。 [Objective] Floral dynamic was observed and breeding system was researched from invasive weed Ipomoea cairica in eastern Guangdong Province,China. [Method] Four standard plots on the basis of ecological investigation were established where cultivated and natural populations of I. cairica existed, floral dynamic and computed P/O, S/O, pollen activity rate and stigma receptivity rate were observed. [Result] The main results were as follows, a complex outcross breeding system of I. cairica was indicated by P/O=2 224 and S/O=0. 56,but outcross was the main mode for I. cairica. I. cairica had a long flowering period and a short fructicative period, the time lasted only a day from opening to languish for individual flower of I. cairica; both varieties showed parabola types for pollen activity rate and stigma receptivity rate,and peak values appeared at 09.30 a. m and 14.30--15.30 p. m respectively. A partial self-pollination breeding system can be reflected by OCI = 5, pollinators were required sometimes. [Conclusion] The breeding system of I. cairica mixes with self-pollination and outcrossing. Some manual control methods such as digging whole plant are suggested to get rid of I. cairica.

关 键 词： 五爪金龙 开花动态 繁育系统 杂交指数 花粉 胚珠比 种子 胚珠比

领　　域： [农业科学] [生物学]